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TEA1103TS датащи(PDF) 8 Page - NXP Semiconductors

номер детали TEA1103TS
подробное описание детали  Fast charge ICs for NiCd and NiMH batteries
Download  28 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1103TS датащи(HTML) 8 Page - NXP Semiconductors

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1999 Jan 27
8
Philips Semiconductors
Preliminary specification
Fast charge ICs for NiCd and NiMH
batteries
TEA1103; TEA1103T;
TEA1103TS
To avoid modulation on the output voltage, the top-off
charge current is DC regulated, defined by the following
equation:
(3)
where:
(4)
The top-off charge current will be approximately 0.15CA,
which maximizes the charge in the battery under safe and
slow charging conditions. The top-off charge period will be
approximately one hour, so the battery will be extra
charged with approximately 0.15 Q. In this way the battery
is fully charged before the system switches over to
standby.
When pin 1 (Vstb) is connected to VS, or no NTC is
connected the system compensates the (self) discharge of
the battery by trickle charge. The trickle charge current will
be pulsating, defined by the following equation:
(5)
During the non current periods at trickle charge the charge
current is regulated to zero, so that the current for a load
connected in series across the battery with the sense
resistor will be supplied by the power supply and not by the
battery.
If at pin 1 (Vstb) a reference voltage is set in accordance
with the specification, and no NTC is connected the charge
mode will switch over from current to voltage regulation
after top-off. The reference regulating voltage can be
adjusted to the battery characteristic by external resistors
connected to pin Vstb.
This reference voltage has to be selected in such a way
that it equals the rest voltage of the battery. By using
voltage regulation, the battery will not be discharged at a
load occurrence. If the Vstb input pin is floating, the
TEA1103x will apply voltage regulation at 1.325 V during
the standby mode (NiCd and NiMH). The current during
voltage regulation is limited to 0.5CA. If the battery charge
current is maximized to 0.5CA for more than 2 hours
charging will be stopped. Moreover, if the temperature
exceeds Tmax, charging will be stopped completely.
As voltage regulation is referred to one cell, the voltage on
the Vbat pin must be the battery voltage divided by the
number of cells (NiCd and NiMH).
When charging, the standby mode can only be entered
after a certain period of time depending on time-out.
To support full test of the TEA1103x at application, the
standby mode is also entered when Vbat <Vbat(l) at top-off.
I
top
off
R
sense
×
R
b
310
6
×
×
=
t
top
off
2
27
TOD
×
t
osc
×
=
I
trickle
R
sense
×
R
b
15
16
------
×
10
6
×
=
Timer
The timing of the circuit is controlled by the oscillator
frequency.
The timer block defines the maximum charging time by
‘time-out’. At a fixed oscillator frequency, the time-out time
can be adapted by the Programmable Time-out Divider
(PTD) using the following equation.
(6)
The time-out timer is put on hold by low voltage,
temperature protection and during the inhibit mode.
The Programmable Oscillator Divider (POD) enables the
oscillator frequency to be increased without affecting
the sampling time and time-out. Raising the oscillator
frequency will reduce the size of the inductive components
that are used.
At fast charging, after battery insertion, after refresh or
supply interruption, the full detector will be disabled for a
period of time to allow a proper start with flat or inverse
polarized batteries. This hold-off period is disabled at fast
charging by raising pin Vstb to above ±5 V (once).
So for test options it is possible to slip the hold-off period.
The hold-off time is defined by the following equation:
(7)
Table 2 gives an overview of the settings of timing and
discharge/charge currents.
t
time
out
2
26
POD
×
PTD
×
t
osc
×
=
t
hold
off
2
5
t
time
out
×
=


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